Quartz crucible forming device

Abstract

The utility model discloses a quartz crucible forming device which comprises a trolley, a first main shaft, a first motor, a second main shaft, a second motor, a vertical shaft, a main rack, an electrode control mechanism, an electrode, a mold, a first water-cooled jacket, a second water-cooled jacket and a water-cooled cover, the second water-cooled jacket is arranged outside the first water-cooled jacket, the water-cooled cover is arranged at the top of the second water-cooled jacket, a semi-closed space is formed outside the first water-cooled jacket and the mold, heat generated by electric arcs in the semi-closed space is hardly lost through air convection, heat conduction, heat radiation and the like, and electric energy loss is greatly reduced; in addition, unknown heat loss of the upper opening of the crucible can be reduced by reducing heat interaction between the upper opening of the mold and the environment, and the quality, thickness and the like of the crucible are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of quartz crucible manufacturing, in particular to a quartz crucible forming device. Background Technique

[0002] The quartz crucible for solar photovoltaic use is an important material for pulling solar and semiconductor single crystal silicon rods. When the quartz crucible is produced by the electric arc process, first, a graphite mold or a metal mold is installed in the melting equipment, and the two are connected by a flange and bolts. Subsequently, high-purity quartz sand raw materials are poured into the graphite mold or the metal mold, and the quartz sand raw materials are evenly formed on the inner surface of the mold through a forming rod. During the forming process of the quartz crucible, the distance between the forming rod and the forming mold is the thickness of the quartz sand layer; then the mold is sent into the melting equipment, and the quartz sand is melted by the electric arc high temperature generated by the graphite electrode. During the melting process, in order to extract the gas in the quartz sand to form the transparent layer of the quartz crucible, the crucible mold used in the preparation of the quartz crucible needs to have many through holes to extract the gas in the quartz sand.

[0003] During the electric arc melting process of quartz sand, the existing production equipment is of a fully open structure. The outside of the mold is a water-cooled jacket, and a water-cooled heat insulation plate is arranged at a position 100 - 300 mm above the mold. A round hole with a diameter of 300 - 700 mm is arranged in the middle of the heat insulation plate as the electrode lifting channel; the round hole in the middle of the heat insulation plate is concentric with the inner diameter of the mold, and the mold and the heat insulation plate are in an open state. During the production process of the quartz crucible, the electrode ionizes the air between the heat insulation plate and the mold opening to generate an electric arc, and the electric arc releases heat. Part of the heat is directly absorbed by the quartz powder through thermal radiation, and part of the heat is absorbed by the quartz powder after being reflected by the heat insulation plate for melting the quartz sand; there is also part of the heat that is conducted to the furnace environment through the gap between the mold and the heat insulation plate and the electrode through hole of the heat insulation plate through convection, thermal radiation and other ways, resulting in a large amount of reactive energy consumption, and the heat released into the furnace will cause the furnace to quickly heat up, resulting in high-temperature damage to the mechanical structure, motor, circuit, etc. in the furnace; in order to reduce the influence of high temperature on the mechanical structure, motor, and circuit in the furnace, the industry generally solves this problem by introducing circulating air into the furnace, and the circulating air will cause air flow disturbance in the furnace, affecting the arc stability; and the open structure will cause other non-quartz substances in the furnace to fall into the mold through the circulating air or directly, resulting in abnormalities such as black spots, bubbles, and attachments on the crucible.

[0004] Therefore, it is necessary to develop a quartz crucible forming device to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to design a quartz crucible forming device to solve the above problems.

[0006] The utility model realizes the above purpose through the following technical solutions:

[0007] A quartz crucible forming device, comprising:

[0008] A trolley; a rotating frame is arranged on the top of the trolley;

[0009] A first main shaft and a first motor; the rotating shaft of the first motor is connected to the lower end of the first main shaft, and the first motor is installed on the second main shaft;

[0010] A second main shaft and a second motor; the second main shaft is rotatably installed on the rotating frame, the second motor is fixedly installed on the rotating frame, and the rotating shaft of the second motor is connected to the second main shaft;

[0011] A vertical shaft;

[0012] A main frame; the vertical shaft is installed on one side of the main frame;

[0013] An electrode control mechanism; the electrode control mechanism is installed on the vertical shaft;

[0014] An electrode; the upper end of the electrode is installed on the electrode control mechanism;

[0015] A mold;

[0016] A first water-cooling jacket; the mold is installed in the first water-cooling jacket, and the lower end of the first water-cooling jacket is connected to the upper end of the first main shaft;

[0017] A second water-cooling jacket; the second water-cooling jacket is sleeved outside the first water-cooling jacket, and a gap is provided between the second water-cooling jacket and the first water-cooling jacket; the lower end of the second water-cooling jacket is connected to the second main shaft;

[0018] A water-cooling cover; a circular hole is provided in the center of the water-cooling cover, the water-cooling cover is covered on the top of the second water-cooling jacket, and the lower end of the electrode passes through the circular hole and is placed in the mold.

[0019] The beneficial effects of the present utility model are as follows:

[0020] By arranging a second water-cooling jacket outside the first water-cooling jacket and a water-cooling cover on the top of the second water-cooling jacket, a semi-closed space is formed outside the first water-cooling jacket and the mold. The heat generated by the arc in the semi-closed space is rarely lost through air convection, heat conduction, heat radiation, etc., greatly reducing the power consumption; in addition, the reduction of the heat interaction between the upper opening of the mold and the environment will reduce the unknown heat loss of the upper opening of the crucible, improving the quality and thickness of the crucible. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram (partially sectional) of the present utility model;

[0022] Figure 2 is Figure 1 an enlarged structural diagram of

[0023] Figure 3It is a schematic assembly structure diagram of the first main shaft and the second main shaft.

[0024] In the figure: 1. Mold; 2. First water-cooling jacket; 3. Second water-cooling jacket; 4. Water-cooling cover; 5. Electrode; 6. Furnace body; 7. Trolley; 8. Vertical shaft; 9. Main frame; 10. Electrode control mechanism; 401. Observation hole; 402. Round hole; 701. First main shaft; 702. Second main shaft. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0027] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0029] In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, terms such as "arrangement" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings.

[0032] As Figures 1-3 shown, a quartz crucible forming device includes:

[0033] A trolley 7; a rotating frame is arranged on the top of the trolley 7;

[0034] A first main shaft 701 and a first motor (not shown in the figure); the rotating shaft of the first motor is connected to the lower end of the first main shaft 701, and the first motor is installed on the second main shaft 702;

[0035] A second main shaft 702 and a second motor (not shown in the figure); the second main shaft 702 is rotatably installed on the rotating frame, the second motor is fixedly installed on the rotating frame, and the rotating shaft of the second motor is connected to the second main shaft 702; the first main shaft 701 and the second main shaft 702 are perpendicular;

[0036] A vertical shaft 8;

[0037] A main frame 9; the vertical shaft 8 is installed on one side of the main frame 9;

[0038] An electrode control mechanism 10; the electrode control mechanism 10 is installed on the vertical shaft 8;

[0039] An electrode 5; the upper end of the electrode 5 is installed on the electrode control mechanism 10;

[0040] A mold 1;

[0041] A first water-cooling jacket 2; the mold 1 is installed inside the first water-cooling jacket 2, and the lower end of the first water-cooling jacket 2 is connected to the upper end of the first main shaft 701;

[0042] A second water-cooling jacket 3; the second water-cooling jacket 3 is sleeved outside the first water-cooling jacket 2, and a gap is provided between the second water-cooling jacket 3 and the first water-cooling jacket 2; the lower end of the second water-cooling jacket 3 is connected to the second main shaft 702;

[0043] Water-cooled cover 4; a circular hole 402 is provided at the center of the water-cooled cover 4. The water-cooled cover 4 is arranged on the top of the second water-cooled sleeve 3, and the lower end of the electrode 5 passes through the circular hole 402 and is placed in the mold 1. The upper side wall of the water-cooled cover 4 is installed on the moving mechanism, and the moving mechanism is installed on the vertical shaft 8.

[0044] As Figure 2 shown, in some embodiments, an observation hole 401 is provided on the side surface of the water-cooled cover 4.

[0045] As Figure 1 shown, in some embodiments, the first main shaft 701, the first water-cooled sleeve 2, and the second water-cooled sleeve 3 are arranged coaxially.

[0046] As Figure 1 shown, in some embodiments, the top height of the second water-cooled sleeve 3 is lower than the top height of the first water-cooled sleeve 2.

[0047] As Figure 1 and 2 shown, this embodiment further includes a furnace body 6. The trolley 7 can perform a reciprocating linear motion inside and outside the furnace body 6 under the action of a servo motor;

[0048] In this embodiment, except for the designs of the first water-cooled sleeve 2, the second water-cooled sleeve 3, the water-cooled cover 4 and their mutual cooperation, the rest are prior arts and will not be further described in terms of structure here.

[0049] In some embodiments, the size of the observation hole 401 is 100 mm (length) * 200 mm (height) to 300 mm (length) * 600 mm (height); the height from the upper edge of the mold 1 to the top of the water-cooled cover 4 is 100 - 300 mm; the gap between the first water-cooled sleeve 2 and the second water-cooled sleeve 3 is 10 - 500 mm; the height difference between the first water-cooled sleeve 2 and the second water-cooled sleeve 3 is 10 mm - 500 mm.

[0050] Description of the working principle of this application:

[0051] During the manufacturing and shaping process of the quartz crucible, first pour the quartz sand into mold 1 (the water-cooled cover 4 is first lifted by the moving mechanism and does not block the pouring of the quartz sand), and use the shaping rod to scrape and shape the quartz sand. After the feeding is completed, the trolley 7 enters the furnace platform, and the second main shaft 702 is rotated by the second motor to make mold 1, the water-cooled cover 4, and the electrode 5 coaxial. Control the water-cooled cover 4 to descend until it contacts the second water-cooled sleeve 3 to form a semi-closed space; control the electrode 5 to enter the inner side of the water-cooled cover 4 between the water-cooled cover 4 and the second water-cooled sleeve 3 through the circular hole 402 provided in the middle of the water-cooled cover 4, and confirm that the electrode 5 reaches the preset position through the observation hole 401. Connect the power supply to control the electrode 5 to close and short-circuit to break down the air and generate an arc. The arc releases heat between the water-cooled cover 4 and the second water-cooled sleeve 3, and the position of the electrode 5 is observed in real time through the observation hole 401, and the electrode 5 is positioned according to the process. The heat released by the electrode 5 is conducted to the quartz powder through heat radiation and other methods. After the quartz powder absorbs the heat, it melts to form a quartz melt; since it is a semi-closed space, very little heat generated by the arc is lost through air convection, heat conduction, heat radiation, etc., greatly reducing the power consumption; in addition, the reduction of the heat exchange between the upper opening of mold 1 and the environment will reduce the unknown heat loss at the upper opening of the crucible, improving the quality, thickness, etc. of the crucible.

[0052] After melting for the specified time and when the crucible reaches the specified thickness and outer diameter, disconnect the power supply, raise the water-cooled cover 4 to separate it from the second water-cooled sleeve 3 and move it away from the upper edge of mold 1, move the trolley 7 outside the furnace body 6, and cool the quartz crucible melt through the first water-cooled sleeve 2 and air; after cooling to the specified temperature, the second motor controls the second main shaft 702 to rotate, so that the first main shaft 701 rotates from an angle of 90° - 100° with the ground horizontal plane to an angle of 10° - -10° with the ground, making the upper opening of mold 1 close to the ground by 10 - 500 mm, vibrate the first water-cooled sleeve 2 inside the second water-cooled sleeve 3 to loosen the quartz sand between the crucible and mold 1 and make it fall off, and finally the crucible falls off to obtain the quartz crucible blank.

[0053] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A quartz crucible forming device, comprising: A trolley; A rotating frame is arranged on the top of the trolley; A first main shaft and a first motor; the rotating shaft of the first motor is connected to the lower end of the first main shaft, and the first motor is installed on the second main shaft; A second main shaft and a second motor; the second main shaft is rotatably installed on the rotating frame, the second motor is fixedly installed on the rotating frame, and the rotating shaft of the second motor is connected to the second main shaft; A vertical shaft; A main frame; the vertical shaft is installed on one side of the main frame; An electrode control mechanism; the electrode control mechanism is installed on the vertical shaft; An electrode; the upper end of the electrode is installed on the electrode control mechanism; A mold; Characterized in that the quartz crucible forming device further comprises: A first water-cooling jacket; the mold is installed in the first water-cooling jacket, and the lower end of the first water-cooling jacket is connected to the upper end of the first main shaft; A second water-cooling jacket; the second water-cooling jacket is sleeved outside the first water-cooling jacket, and a gap is provided between the second water-cooling jacket and the first water-cooling jacket; the lower end of the second water-cooling jacket is connected to the second main shaft; A water-cooling cover; a round hole is provided in the center of the water-cooling cover, the water-cooling cover is covered on the top of the second water-cooling jacket, and the lower end of the electrode passes through the round hole and is placed in the mold.

2. The quartz crucible forming device according to claim 1, wherein, An observation hole is provided on the side surface of the water-cooling cover.

3. A quartz crucible forming device according to claim 1, characterized in that, The first main shaft and the second main shaft are perpendicular.

4. A quartz crucible forming device according to claim 1, characterized in that, The first main shaft, the first water-cooling jacket and the second water-cooling jacket are arranged coaxially.

5. A quartz crucible forming device according to claim 1, characterized in that, The top height of the second water-cooling jacket is lower than the top height of the first water-cooling jacket.

6. The quartz crucible forming device according to claim 1, wherein, The upper side wall of the water-cooling cover is installed on a moving mechanism, and the moving mechanism is installed on the vertical shaft.

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